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For additional help on upgrading Mac OS X past the first installation, please see my Upgrade FAQ.If you need technical support for issues after reading this FAQ, please visit my Tech Support page, where I offer fee based support.This page is divided up into several sections: Will suffer the performance lags typical when running in emulation mode.This page was spun off of Mac OS X speed FAQ.If upgrading to X for the first time, be sure to read the warning about firmware first and if upgrading to Mac OS X 10.3 for the first time, be sure to also read the Firewire bug report. It is also the last Mac OS X version that supports PowerPC based applications, as Mac OS X v10.7 'Lion' dropped support for Rosetta.Apple Computer's recently announced move from IBM's PowerPC to Intel processors. Apple's Intel Transition was the process of changing the Central Processing Unit (CPU) of.

Running non-Apple operating systems on the Mac What is Classic? Includes info on Intel Macs Using restore disks to install Mac OS 9 Macs that can't boot beyond a specific version of Mac OS X Table of OS 9 capabilities for each Mac model able to run X

It may related to an earlier 10.4 bug that I indicated below, about using the Migration Assistant between PowerPC and Intel Macs. 10.6.2 resolves this issue according to Apple. Personal Digital Assistants (PDAs) and Cell phonesPlease sign guestbook if you are aware of other links to Mac OS X software or hardware directories and search engines.WARNING: If you use Guest accounts in Snow Leopard, a bug has been that wipes the guest account contents entirely. Printers also discusses printing from Classic environment, and Intel Macs Migrate data from a pre-X machine to an X machine Partition hard drive to be Intel or PowerPC compatible

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Macs from 2003 with few exceptions through 2005 fell in this stage.3. Macs which could install Mac OS X, and use only the restore disks to install Mac OS 9 for use with the Classic environment. Macs of 1998 through 2002 pretty much fell in this stage.2. Macs which could install Mac OS X and Mac OS 9 and boot into both, and use Classic in Mac OS X to have limited Mac OS 9 driver compatibility but the ability to run most Mac OS 9 applications. The migration to Mac OS X went in these stages:1. You can also migrate from PowerPC to Intel Macs using the user tip on: Apple's migration to Mac OS X means that if you want to run Mac OS X as smoothly as possible, you'll want Mac OS X native applications and hardware.

Classic is not available on Intel Macs, but continues until stage 4 when 10.5 is released on PowerPC Macs. As part of that transition, Apple also introduced Universal software code that ran both on Intel as native software, and on PowerPC natively, and Intel only code for Intel Mac Applications. This allowed Apple to continue with Mac OS X, and PowerPC code under a new CPU architecture by Intel. This stage began January 2006, and ends October 25, 2007.3.5 January 2006 Mac OS X 10.4.4's release on Intel Macs introduces a new third party code known as Rosetta.

2nd stage Macs need 10.4.11 or less installed to use Classic. 1st stage Macs of 867 Mhz or greater are still be able to boot into Mac OS 9. Used and Refurbished Macs manufactured from the prior stages which don't have 10.5 installed will not change their capabilities unless 10.5 is installed. Starting October 26th, 2007 Apple's knowledgebase article 303137 has now announced the demise of Classic. Classic disappears under 10.5 (it still runs under 10.4.11 on PowerPC Macs).

The first operating system totally divorced from PowerPC Mac hardware, however it is capable of still running PowerPC software like 10.5 to 10.5.8 was before it. August 28, 2009, Apple introduces Snow Leopard, Mac OS X 10.6. Partitioning instructions are on Apple Article 613015. Rosetta continues to be available for Intel Macs. It is possible to have one 10.5 and one 10.4.11 or less partition on the same machine, or a separate Firewire hard drive on the same machine with 10.4.11 or less to be able to use Classic.

Now not only is the operating system divorced from PowerPC hardware, but software as well. July 20, 2011: Mac OS X Lion's release. 512 MB, 540 MB, 640 MB, or 768 MB of RAM won't cut it) in order to install Snow Leopard.6. Also the Macs which are compatible must have a minimum of 1 GB of RAM (You can find this in Apple menu -> About This Mac. This means if you have a Mac Mini with only 2 USB ports on the rear (as opposed to 4 or 5), an iMac G5 or less (link helps you identify iMac G5s from Intels), a PowerMac G5 or less (The Mac Pro looks like , whereas the PowerMac G5 looks like ), a Powerbook or an iBook, you won't be able to use Snow Leopard, and will have to settle for Leopard or less.

There is a way to increase the memory allocation of Classic, as described by the knowledgebase article mh1834.html. For more on what this means, I wrote an extensive tip on Apple Support Communities.If your Mac is one that follows the first or second stage, below is an explanation of how to deal only with Classic (with 10.4.11 or less installed):128 MB of RAM is given the Classic environment by default, so if you need more for your application, it is better to have a machine that can boot into Mac OS 9, or Mac OS X native applications that are equivalent to the one you are using in 9. See the Intel section of this tip for more about the software compatibility. For more details about Lion, see my Upgrade FAQ details. This means if you have data that needs migrating from a PowerPC Mac to an Intel Mac, you need to find an intermediate format that works on both before upgrading. It will only run on Core2Duo, Xeon, and Core i processors by Intel in Macs.

Without 9.1 or later's Startup Disk control panel, booting into Mac OS X from 9 necessitates 9 be installed on the same partition (if you don't know what a partition is, don't worry about it) as X and restarting the Mac with the 'X' key to switch back to Mac OS X. While it won't give Classic compatibility, it will at least give you complete capability to switch back to X when in 9, even if you only have 9.0. People on Apple Discussions have been able to test it working with 8.6 and later. Ignore the download links prerequisite. For best compatibility with Classic, you should upgrade your Mac OS 9 version to 9.2.2 first using Apple's knowledgebase article 75288.Some people who are stuck with 9.0 compatible software that won't upgrade to 9.1 compatibility may want to elect to download the 9.1 Startup Disk control panel. Apple has in a knowledgebase which Macs won't boot into Mac OS 9 and require using Classic for compatibility in article 86209 An additional note, if you are going to run Mac OS 9 applications in Classic or booting into 9, Mac OS X permissions are not observed by Mac OS 9 applications, and as a result you have to repair permissions when done with Classic or booting into 9.

The retail 9 CDs are white with an orange 9 logo. To find out if your Mac came with a Mac OS 9 CD, see Apple Article 255. If you need to upgrade to Mac OS 9 first from 8.6 or earlier, follow these directions to install Mac OS 9: Apple Article 58176, and to get updates for Mac OS 9 from this C!Net page If your Mac came with a Mac OS 9 CD, you can only use a newer retail 9 CD or the updates on this page to upgrade Mac OS 9 on it. Apple offers for Mac OS X 10.1.5 the Repair Privileges Utility to do the same.If using an earlier version of Mac OS X it is recommended you upgrade to at least 10.1.5 if you are going to use Mac OS 9 applications on the same machine as Mac OS X.If you have determined you can't upgrade to Mac OS X right away, and need a new computer, these used and refurbished Mac sites will sell you Macs that can boot into Mac OS 9.

Using Restore Disks to Install Mac OS 9 and Mac OS X Some machines that came with Mac OS X, did not come with a Mac OS 9 CD. Macs which came with 9.2.2 on CD have no further 9 updates available to them except from third party. Macs that came with 9.2.1 can only be upgraded to 9.2.2 update on article 75288 mentioned above.

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